forks/go-ethereum
1
0
Fork 1
mirror of https://github.com/ethereum/go-ethereum.git synced 2026-08-20 10:52:25 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Implement Ubqhash cache generation

Browse source
This commit is contained in:
Julian Yap 2019-02-28 23:36:25 -08:00
parent 3880d00a4a
commit f2953a2eae
1 changed files with 8 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
consensus/ubqhash/algorithm.go
View file

@ -31,6 +31,8 @@ import (
"github.com/ubiq/go-ubiq/crypto" "github.com/ubiq/go-ubiq/crypto"
"github.com/ubiq/go-ubiq/crypto/sha3" "github.com/ubiq/go-ubiq/crypto/sha3"
"github.com/ubiq/go-ubiq/log" "github.com/ubiq/go-ubiq/log"
"golang.org/x/crypto/blake2b"
) )
const ( const (
@ -45,6 +47,8 @@ const (
datasetParents = 256 // Number of parents of each dataset element datasetParents = 256 // Number of parents of each dataset element
cacheRounds = 3 // Number of rounds in cache production cacheRounds = 3 // Number of rounds in cache production
loopAccesses = 64 // Number of accesses in hashimoto loop loopAccesses = 64 // Number of accesses in hashimoto loop
uip1Epoch = 22
) )
// hasher is a repetitive hasher allowing the same hash data structures to be // hasher is a repetitive hasher allowing the same hash data structures to be
@ -124,6 +128,10 @@ func generateCache(dest []uint32, epoch uint64, seed []byte) {
}() }()
// Create a hasher to reuse between invocations // Create a hasher to reuse between invocations
keccak512 := makeHasher(sha3.NewKeccak512()) keccak512 := makeHasher(sha3.NewKeccak512())
if epoch > uip1Epoch {
h, _ := blake2b.New512(nil)
keccak512 = makeHasher(h)
}
// Sequentially produce the initial dataset // Sequentially produce the initial dataset
keccak512(cache, seed) keccak512(cache, seed)